![background image](http://html2.mh-extra.com/html/watts/aerco-bmk-750/aerco-bmk-750_operation-and-service-manual_3787105114.webp)
Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 7
– BOILER SEQUENCING TECHNOLOGY
OMM-0145_A99
• GF-218 • 9/18/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
114
of
157
OPTION 4
Instructions: Outdoor Reset, Modbus Header Temp Sensor & Modbus Outdoor
Temp Sensor
NOTES:
•
Polarity must be observed for the RS485 connections.
•
Ground the shield at any
SHLD
terminal in the I/O the Board.
•
When mounting the Outdoor sensor, it must be located on the North side of the building
where an average outside air temperature is expected. The sensor must be shielded
from direct sunlight as well as impingement by the elements. The outdoor sensor may
be wired up to 200 feet (61m) from the boiler.
•
There is no polarity to be observed. The ground for the shield is at the power supply
ground. The sensor end of the shield must be left free and ungrounded.
Step 3
– OPTION 4 CONFIGURATION
Using the Modbus Transmitter provides gives the plant the ability to use the Backup
manager feature. This allows the any of the client units to become a Backup manager if
the manager unit is not communicating.
On All Boiler:
1. Go to:
Main Menu
→
Advanced Setup
→
BST Cascade
→
Cascade Configuration
:
•
Set the
Unit Mode
parameter to
BST Client
.
2. Go to:
Main Menu
→
Advanced Setup
→
BST Cascade
→
Application Configuration
:
•
Set the
Unit Address
parameter to the communication address of the unit.
On the BST Manager only:
1. Go to
Main Menu
→
Advanced Setup
→
BST Cascade
, set the Parameters to the Values
in each menu in the table below.
Menu/Screen Name
Parameters
Values
Cascade
Configuration
Auto Manager Transfer
Enabled (This is available on the Manger unit
only)
Auto failover Type
C-More
Backup Manager Address Enter the designated backup unit address
Unit Mode
BST Manager
Hdr Temp Sensor
Network
Sensor
Comm Address
240
Hdr Temp Point
14
Application
Configuration
Application
Space Heating
SH Operating Mode
Outdoor Reset
MODBUS TRANSMITTER
OUTDOOR TEMP SENSOR
I/O BOARD